<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 头部的警告区域 -->
      <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false"></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selecatedkeys"
            :options="catelist"
            :props="{ expandTrigger: 'hover',value:'cat_id',label:'cat_name',children:'children' }"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <!-- 动态参数的表格 -->
          <el-table :data="manyTableDate" border stripe>
            <!-- 这是展开行 -->
            <el-table-column type="expand">
              <template v-slot:="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag closable v-for="(item, i) in scope.row.attr_vals" :key="i">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加属性</el-button>
          <!-- 静态属性的表格 -->
          <el-table :data="onlyTableDate" border stripe>
            <!-- 这是展开行 -->
           <el-table-column type="expand">
              <template v-slot:="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag closable v-for="(item, i) in scope.row.attr_vals" :key="i">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框双向数据绑定
      selecatedkeys: [],
      //   被激活的页签名称
      activeName: "many",
      //   动态参数的定义
      manyTableDate: [],
      // 静态参数的定义
      onlyTableDate: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: "",
      },
      // 添加表单验证规则的对象
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur",
          },
        ],
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单数据对象
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur",
          },
        ],
      },
      //控制按钮与文本框的显示
      inputVisible:false,
      // 文本框中输入的内容
      inputValue:''
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败");
      }
      this.catelist = res.data;
      console.log(this.catelist);
    },
    //   级联选择框选中项变化，会触发这个函数
    handleChange() {
      this.getParamsData();
    },
    // tab页签点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName);
      this.getParamsData();
    },
    // 获取参数的列表数据
    async getParamsData() {
      if (this.selecatedkeys.length !== 3) {
        this.selecatedkeys = [];
        this.manyTableDate=[]
        this.onlyTableDate=[]
        return;
      }
      // 证明选中的是三级分类
      console.log(this.selecatedkeys);
      //   根据所选的分类的Id，和当前所处的面板获取对应的参数
      const {
        data: res,
      } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName },
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败！");
      }

      res.data.forEach((item) => {
        //  避免参数为空的bug
        item.attr_vals = item.attr_vals
          ? (item.attr_vals = item.attr_vals.split(" "))
          : [];
          // 控制文本框的显示与隐藏
         item.inputVisible =false
          // 文本框中输入的值
          item.inputValue = ''
      });
      console.log(res.data);
      if (this.activeName === "many") {
        this.manyTableDate = res.data;
      } else {
        this.onlyTableDate = res.data;
      }
    },
    // 监听对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击按钮。添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const {
          data: res,
        } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName,
        });
        if (res.meta.status !== 201) {
          return this.$message.error("添加参数失败");
        }
        this.$message.success("添加参数成功");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    // 点击按钮展示修改的对话框
    async showEditDialog(attr_id) {
      // 查询当前修改的对话框
      const {
        data: res,
      } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        { params: { attr_sel: this.activeName } }
      );
      //    不知道为什么报错
      //    if(res.mata.status!==200){
      //        return this.$$message.error('获取参数信息失败')
      //    }
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    // 重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    //点击按钮，修改参数信息
    editParams() {
      this.$reds.editFormRef.validate(async (valid) => {
        if (!valid) return;
        const {
          data: res,
        } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("修改参数失败");
        }
        this.$message.success("修改参数成功");
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },
    // 根据id删除对应项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch(err => err);
      // 用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除！');
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！');
      }
      this.$message.success('删除参数成功');
      this.getParamsData();
    },
    // 文本框失去焦点或者安心enter键都会触发
   async handleInputConfirm(row){
      if(row.inputVisible.trim().length===0){
          row.inputValue = ''
          row.inputVisible = false
          return
      }
      // 如果没有return.则证明输入的内容，需要做后续处理
      // 这里报错了没有定义row.
          row.attr_vals.push(row.inputValue.trim())
          row.inputValue=''
          row.inputVisible=false
          // 需要发起请求保存这次操作
         const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
            attr_name:row.attr_name,
            attr_sel:row.attr_sel,
            attr_vals:row.attr_vals.join(' ')

          })
          if(res.meta.status!==200){
            return this.$message.error('修改参数项失败！')
          }
          this.$message.success('修改参属项成功！')
    },
    // 点击按钮展示文本输入框
    showInput(row){
        row.inputVisible = true
        // 让文本框自动获得焦点
        // $nexttick方法的作用，就是当页面上的元素被重新渲染之后才会指定回调函数中的代码
         this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
  },
  computed: {
    //  如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selecatedkeys.length !== 3) {
        return true;
      }
      return false;
    },
    //  当前选中的三级id
    cateId() {
      if (this.selecatedkeys.length === 3) {
        return this.selecatedkeys[2];
      }
      return null;
    },
    //  动态计算标题的属性
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态属性";
    },
  },
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag{
  width: 120px;
}
</style>